if_bridge.c revision 1.75
1 /* $NetBSD: if_bridge.c,v 1.75 2012/03/13 18:40:58 elad Exp $ */ 2 3 /* 4 * Copyright 2001 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 /* 39 * Copyright (c) 1999, 2000 Jason L. Wright (jason (at) thought.net) 40 * All rights reserved. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 3. All advertising materials mentioning features or use of this software 51 * must display the following acknowledgement: 52 * This product includes software developed by Jason L. Wright 53 * 4. The name of the author may not be used to endorse or promote products 54 * derived from this software without specific prior written permission. 55 * 56 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 57 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 58 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 59 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 60 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 61 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 62 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 63 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 64 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 65 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 66 * POSSIBILITY OF SUCH DAMAGE. 67 * 68 * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp 69 */ 70 71 /* 72 * Network interface bridge support. 73 * 74 * TODO: 75 * 76 * - Currently only supports Ethernet-like interfaces (Ethernet, 77 * 802.11, VLANs on Ethernet, etc.) Figure out a nice way 78 * to bridge other types of interfaces (FDDI-FDDI, and maybe 79 * consider heterogenous bridges). 80 */ 81 82 #include <sys/cdefs.h> 83 __KERNEL_RCSID(0, "$NetBSD: if_bridge.c,v 1.75 2012/03/13 18:40:58 elad Exp $"); 84 85 #ifdef _KERNEL_OPT 86 #include "opt_bridge_ipf.h" 87 #include "opt_inet.h" 88 #include "opt_pfil_hooks.h" 89 #endif /* _KERNEL_OPT */ 90 91 #include <sys/param.h> 92 #include <sys/kernel.h> 93 #include <sys/mbuf.h> 94 #include <sys/queue.h> 95 #include <sys/socket.h> 96 #include <sys/socketvar.h> /* for softnet_lock */ 97 #include <sys/sockio.h> 98 #include <sys/systm.h> 99 #include <sys/proc.h> 100 #include <sys/pool.h> 101 #include <sys/kauth.h> 102 #include <sys/cpu.h> 103 #include <sys/cprng.h> 104 105 #include <net/bpf.h> 106 #include <net/if.h> 107 #include <net/if_dl.h> 108 #include <net/if_types.h> 109 #include <net/if_llc.h> 110 111 #include <net/if_ether.h> 112 #include <net/if_bridgevar.h> 113 114 #if defined(BRIDGE_IPF) && defined(PFIL_HOOKS) 115 /* Used for bridge_ip[6]_checkbasic */ 116 #include <netinet/in.h> 117 #include <netinet/in_systm.h> 118 #include <netinet/ip.h> 119 #include <netinet/ip_var.h> 120 #include <netinet/ip_private.h> /* XXX */ 121 122 #include <netinet/ip6.h> 123 #include <netinet6/in6_var.h> 124 #include <netinet6/ip6_var.h> 125 #include <netinet6/ip6_private.h> /* XXX */ 126 #endif /* BRIDGE_IPF && PFIL_HOOKS */ 127 128 /* 129 * Size of the route hash table. Must be a power of two. 130 */ 131 #ifndef BRIDGE_RTHASH_SIZE 132 #define BRIDGE_RTHASH_SIZE 1024 133 #endif 134 135 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 136 137 #include "carp.h" 138 #if NCARP > 0 139 #include <netinet/in.h> 140 #include <netinet/in_var.h> 141 #include <netinet/ip_carp.h> 142 #endif 143 144 /* 145 * Maximum number of addresses to cache. 146 */ 147 #ifndef BRIDGE_RTABLE_MAX 148 #define BRIDGE_RTABLE_MAX 100 149 #endif 150 151 /* 152 * Spanning tree defaults. 153 */ 154 #define BSTP_DEFAULT_MAX_AGE (20 * 256) 155 #define BSTP_DEFAULT_HELLO_TIME (2 * 256) 156 #define BSTP_DEFAULT_FORWARD_DELAY (15 * 256) 157 #define BSTP_DEFAULT_HOLD_TIME (1 * 256) 158 #define BSTP_DEFAULT_BRIDGE_PRIORITY 0x8000 159 #define BSTP_DEFAULT_PORT_PRIORITY 0x80 160 #define BSTP_DEFAULT_PATH_COST 55 161 162 /* 163 * Timeout (in seconds) for entries learned dynamically. 164 */ 165 #ifndef BRIDGE_RTABLE_TIMEOUT 166 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 167 #endif 168 169 /* 170 * Number of seconds between walks of the route list. 171 */ 172 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 173 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 174 #endif 175 176 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 177 178 static struct pool bridge_rtnode_pool; 179 180 void bridgeattach(int); 181 182 static int bridge_clone_create(struct if_clone *, int); 183 static int bridge_clone_destroy(struct ifnet *); 184 185 static int bridge_ioctl(struct ifnet *, u_long, void *); 186 static int bridge_init(struct ifnet *); 187 static void bridge_stop(struct ifnet *, int); 188 static void bridge_start(struct ifnet *); 189 190 static void bridge_forward(void *); 191 192 static void bridge_timer(void *); 193 194 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 195 struct mbuf *); 196 197 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 198 struct ifnet *, int, uint8_t); 199 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *); 200 static void bridge_rttrim(struct bridge_softc *); 201 static void bridge_rtage(struct bridge_softc *); 202 static void bridge_rtflush(struct bridge_softc *, int); 203 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *); 204 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp); 205 206 static int bridge_rtable_init(struct bridge_softc *); 207 static void bridge_rtable_fini(struct bridge_softc *); 208 209 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 210 const uint8_t *); 211 static int bridge_rtnode_insert(struct bridge_softc *, 212 struct bridge_rtnode *); 213 static void bridge_rtnode_destroy(struct bridge_softc *, 214 struct bridge_rtnode *); 215 216 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 217 const char *name); 218 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 219 struct ifnet *ifp); 220 static void bridge_delete_member(struct bridge_softc *, 221 struct bridge_iflist *); 222 223 static int bridge_ioctl_add(struct bridge_softc *, void *); 224 static int bridge_ioctl_del(struct bridge_softc *, void *); 225 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 226 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 227 static int bridge_ioctl_scache(struct bridge_softc *, void *); 228 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 229 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 230 static int bridge_ioctl_rts(struct bridge_softc *, void *); 231 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 232 static int bridge_ioctl_sto(struct bridge_softc *, void *); 233 static int bridge_ioctl_gto(struct bridge_softc *, void *); 234 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 235 static int bridge_ioctl_flush(struct bridge_softc *, void *); 236 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 237 static int bridge_ioctl_spri(struct bridge_softc *, void *); 238 static int bridge_ioctl_ght(struct bridge_softc *, void *); 239 static int bridge_ioctl_sht(struct bridge_softc *, void *); 240 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 241 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 242 static int bridge_ioctl_gma(struct bridge_softc *, void *); 243 static int bridge_ioctl_sma(struct bridge_softc *, void *); 244 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 245 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 246 #if defined(BRIDGE_IPF) && defined(PFIL_HOOKS) 247 static int bridge_ioctl_gfilt(struct bridge_softc *, void *); 248 static int bridge_ioctl_sfilt(struct bridge_softc *, void *); 249 static int bridge_ipf(void *, struct mbuf **, struct ifnet *, int); 250 static int bridge_ip_checkbasic(struct mbuf **mp); 251 # ifdef INET6 252 static int bridge_ip6_checkbasic(struct mbuf **mp); 253 # endif /* INET6 */ 254 #endif /* BRIDGE_IPF && PFIL_HOOKS */ 255 256 struct bridge_control { 257 int (*bc_func)(struct bridge_softc *, void *); 258 int bc_argsize; 259 int bc_flags; 260 }; 261 262 #define BC_F_COPYIN 0x01 /* copy arguments in */ 263 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 264 #define BC_F_SUSER 0x04 /* do super-user check */ 265 266 static const struct bridge_control bridge_control_table[] = { 267 [BRDGADD] = {bridge_ioctl_add, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 268 [BRDGDEL] = {bridge_ioctl_del, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 269 270 [BRDGGIFFLGS] = {bridge_ioctl_gifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_COPYOUT}, 271 [BRDGSIFFLGS] = {bridge_ioctl_sifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 272 273 [BRDGSCACHE] = {bridge_ioctl_scache, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 274 [BRDGGCACHE] = {bridge_ioctl_gcache, sizeof(struct ifbrparam), BC_F_COPYOUT}, 275 276 [BRDGGIFS] = {bridge_ioctl_gifs, sizeof(struct ifbifconf), BC_F_COPYIN|BC_F_COPYOUT}, 277 [BRDGRTS] = {bridge_ioctl_rts, sizeof(struct ifbaconf), BC_F_COPYIN|BC_F_COPYOUT}, 278 279 [BRDGSADDR] = {bridge_ioctl_saddr, sizeof(struct ifbareq), BC_F_COPYIN|BC_F_SUSER}, 280 281 [BRDGSTO] = {bridge_ioctl_sto, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 282 [BRDGGTO] = {bridge_ioctl_gto, sizeof(struct ifbrparam), BC_F_COPYOUT}, 283 284 [BRDGDADDR] = {bridge_ioctl_daddr, sizeof(struct ifbareq), BC_F_COPYIN|BC_F_SUSER}, 285 286 [BRDGFLUSH] = {bridge_ioctl_flush, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 287 288 [BRDGGPRI] = {bridge_ioctl_gpri, sizeof(struct ifbrparam), BC_F_COPYOUT}, 289 [BRDGSPRI] = {bridge_ioctl_spri, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 290 291 [BRDGGHT] = {bridge_ioctl_ght, sizeof(struct ifbrparam), BC_F_COPYOUT}, 292 [BRDGSHT] = {bridge_ioctl_sht, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 293 294 [BRDGGFD] = {bridge_ioctl_gfd, sizeof(struct ifbrparam), BC_F_COPYOUT}, 295 [BRDGSFD] = {bridge_ioctl_sfd, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 296 297 [BRDGGMA] = {bridge_ioctl_gma, sizeof(struct ifbrparam), BC_F_COPYOUT}, 298 [BRDGSMA] = {bridge_ioctl_sma, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 299 300 [BRDGSIFPRIO] = {bridge_ioctl_sifprio, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 301 302 [BRDGSIFCOST] = {bridge_ioctl_sifcost, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 303 #if defined(BRIDGE_IPF) && defined(PFIL_HOOKS) 304 [BRDGGFILT] = {bridge_ioctl_gfilt, sizeof(struct ifbrparam), BC_F_COPYOUT}, 305 [BRDGSFILT] = {bridge_ioctl_sfilt, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 306 #endif /* BRIDGE_IPF && PFIL_HOOKS */ 307 }; 308 static const int bridge_control_table_size = __arraycount(bridge_control_table); 309 310 static LIST_HEAD(, bridge_softc) bridge_list; 311 312 static struct if_clone bridge_cloner = 313 IF_CLONE_INITIALIZER("bridge", bridge_clone_create, bridge_clone_destroy); 314 315 /* 316 * bridgeattach: 317 * 318 * Pseudo-device attach routine. 319 */ 320 void 321 bridgeattach(int n) 322 { 323 324 pool_init(&bridge_rtnode_pool, sizeof(struct bridge_rtnode), 325 0, 0, 0, "brtpl", NULL, IPL_NET); 326 327 LIST_INIT(&bridge_list); 328 if_clone_attach(&bridge_cloner); 329 } 330 331 /* 332 * bridge_clone_create: 333 * 334 * Create a new bridge instance. 335 */ 336 static int 337 bridge_clone_create(struct if_clone *ifc, int unit) 338 { 339 struct bridge_softc *sc; 340 struct ifnet *ifp; 341 int s; 342 343 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 344 ifp = &sc->sc_if; 345 346 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 347 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 348 sc->sc_bridge_max_age = BSTP_DEFAULT_MAX_AGE; 349 sc->sc_bridge_hello_time = BSTP_DEFAULT_HELLO_TIME; 350 sc->sc_bridge_forward_delay = BSTP_DEFAULT_FORWARD_DELAY; 351 sc->sc_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY; 352 sc->sc_hold_time = BSTP_DEFAULT_HOLD_TIME; 353 sc->sc_filter_flags = 0; 354 355 /* software interrupt to do the work */ 356 sc->sc_softintr = softint_establish(SOFTINT_NET, bridge_forward, sc); 357 if (sc->sc_softintr == NULL) { 358 free(sc, M_DEVBUF); 359 return ENOMEM; 360 } 361 362 /* Initialize our routing table. */ 363 bridge_rtable_init(sc); 364 365 callout_init(&sc->sc_brcallout, 0); 366 callout_init(&sc->sc_bstpcallout, 0); 367 368 LIST_INIT(&sc->sc_iflist); 369 370 if_initname(ifp, ifc->ifc_name, unit); 371 ifp->if_softc = sc; 372 ifp->if_mtu = ETHERMTU; 373 ifp->if_ioctl = bridge_ioctl; 374 ifp->if_output = bridge_output; 375 ifp->if_start = bridge_start; 376 ifp->if_stop = bridge_stop; 377 ifp->if_init = bridge_init; 378 ifp->if_type = IFT_BRIDGE; 379 ifp->if_addrlen = 0; 380 ifp->if_dlt = DLT_EN10MB; 381 ifp->if_hdrlen = ETHER_HDR_LEN; 382 IFQ_SET_READY(&ifp->if_snd); 383 384 if_attach(ifp); 385 386 if_alloc_sadl(ifp); 387 388 s = splnet(); 389 LIST_INSERT_HEAD(&bridge_list, sc, sc_list); 390 splx(s); 391 392 return (0); 393 } 394 395 /* 396 * bridge_clone_destroy: 397 * 398 * Destroy a bridge instance. 399 */ 400 static int 401 bridge_clone_destroy(struct ifnet *ifp) 402 { 403 struct bridge_softc *sc = ifp->if_softc; 404 struct bridge_iflist *bif; 405 int s; 406 407 s = splnet(); 408 409 bridge_stop(ifp, 1); 410 411 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL) 412 bridge_delete_member(sc, bif); 413 414 LIST_REMOVE(sc, sc_list); 415 416 splx(s); 417 418 if_detach(ifp); 419 420 /* Tear down the routing table. */ 421 bridge_rtable_fini(sc); 422 423 softint_disestablish(sc->sc_softintr); 424 425 free(sc, M_DEVBUF); 426 427 return (0); 428 } 429 430 /* 431 * bridge_ioctl: 432 * 433 * Handle a control request from the operator. 434 */ 435 static int 436 bridge_ioctl(struct ifnet *ifp, u_long cmd, void *data) 437 { 438 struct bridge_softc *sc = ifp->if_softc; 439 struct lwp *l = curlwp; /* XXX */ 440 union { 441 struct ifbreq ifbreq; 442 struct ifbifconf ifbifconf; 443 struct ifbareq ifbareq; 444 struct ifbaconf ifbaconf; 445 struct ifbrparam ifbrparam; 446 } args; 447 struct ifdrv *ifd = (struct ifdrv *) data; 448 const struct bridge_control *bc = NULL; /* XXXGCC */ 449 int s, error = 0; 450 451 /* Authorize command before calling splnet(). */ 452 switch (cmd) { 453 case SIOCGDRVSPEC: 454 case SIOCSDRVSPEC: 455 if (ifd->ifd_cmd >= bridge_control_table_size) { 456 error = EINVAL; 457 return error; 458 } 459 460 bc = &bridge_control_table[ifd->ifd_cmd]; 461 462 /* We only care about BC_F_SUSER at this point. */ 463 if ((bc->bc_flags & BC_F_SUSER) == 0) 464 break; 465 466 error = kauth_authorize_network(l->l_cred, 467 KAUTH_NETWORK_INTERFACE_BRIDGE, 468 cmd == SIOCGDRVSPEC ? 469 KAUTH_REQ_NETWORK_INTERFACE_BRIDGE_GETPRIV : 470 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, 471 ifd, NULL, NULL); 472 if (error) 473 return (error); 474 475 break; 476 } 477 478 s = splnet(); 479 480 switch (cmd) { 481 case SIOCGDRVSPEC: 482 case SIOCSDRVSPEC: 483 KASSERT(bc != NULL); 484 if (cmd == SIOCGDRVSPEC && 485 (bc->bc_flags & BC_F_COPYOUT) == 0) { 486 error = EINVAL; 487 break; 488 } 489 else if (cmd == SIOCSDRVSPEC && 490 (bc->bc_flags & BC_F_COPYOUT) != 0) { 491 error = EINVAL; 492 break; 493 } 494 495 /* BC_F_SUSER is checked above, before splnet(). */ 496 497 if (ifd->ifd_len != bc->bc_argsize || 498 ifd->ifd_len > sizeof(args)) { 499 error = EINVAL; 500 break; 501 } 502 503 memset(&args, 0, sizeof(args)); 504 if (bc->bc_flags & BC_F_COPYIN) { 505 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 506 if (error) 507 break; 508 } 509 510 error = (*bc->bc_func)(sc, &args); 511 if (error) 512 break; 513 514 if (bc->bc_flags & BC_F_COPYOUT) 515 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 516 517 break; 518 519 case SIOCSIFFLAGS: 520 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 521 break; 522 switch (ifp->if_flags & (IFF_UP|IFF_RUNNING)) { 523 case IFF_RUNNING: 524 /* 525 * If interface is marked down and it is running, 526 * then stop and disable it. 527 */ 528 (*ifp->if_stop)(ifp, 1); 529 break; 530 case IFF_UP: 531 /* 532 * If interface is marked up and it is stopped, then 533 * start it. 534 */ 535 error = (*ifp->if_init)(ifp); 536 break; 537 default: 538 break; 539 } 540 break; 541 542 default: 543 error = ifioctl_common(ifp, cmd, data); 544 break; 545 } 546 547 splx(s); 548 549 return (error); 550 } 551 552 /* 553 * bridge_lookup_member: 554 * 555 * Lookup a bridge member interface. Must be called at splnet(). 556 */ 557 static struct bridge_iflist * 558 bridge_lookup_member(struct bridge_softc *sc, const char *name) 559 { 560 struct bridge_iflist *bif; 561 struct ifnet *ifp; 562 563 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 564 ifp = bif->bif_ifp; 565 if (strcmp(ifp->if_xname, name) == 0) 566 return (bif); 567 } 568 569 return (NULL); 570 } 571 572 /* 573 * bridge_lookup_member_if: 574 * 575 * Lookup a bridge member interface by ifnet*. Must be called at splnet(). 576 */ 577 static struct bridge_iflist * 578 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 579 { 580 struct bridge_iflist *bif; 581 582 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 583 if (bif->bif_ifp == member_ifp) 584 return (bif); 585 } 586 587 return (NULL); 588 } 589 590 /* 591 * bridge_delete_member: 592 * 593 * Delete the specified member interface. 594 */ 595 static void 596 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif) 597 { 598 struct ifnet *ifs = bif->bif_ifp; 599 600 switch (ifs->if_type) { 601 case IFT_ETHER: 602 /* 603 * Take the interface out of promiscuous mode. 604 */ 605 (void) ifpromisc(ifs, 0); 606 break; 607 default: 608 #ifdef DIAGNOSTIC 609 panic("bridge_delete_member: impossible"); 610 #endif 611 break; 612 } 613 614 ifs->if_bridge = NULL; 615 LIST_REMOVE(bif, bif_next); 616 617 bridge_rtdelete(sc, ifs); 618 619 free(bif, M_DEVBUF); 620 621 if (sc->sc_if.if_flags & IFF_RUNNING) 622 bstp_initialization(sc); 623 } 624 625 static int 626 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 627 { 628 struct ifbreq *req = arg; 629 struct bridge_iflist *bif = NULL; 630 struct ifnet *ifs; 631 int error = 0; 632 633 ifs = ifunit(req->ifbr_ifsname); 634 if (ifs == NULL) 635 return (ENOENT); 636 637 if (sc->sc_if.if_mtu != ifs->if_mtu) 638 return (EINVAL); 639 640 if (ifs->if_bridge == sc) 641 return (EEXIST); 642 643 if (ifs->if_bridge != NULL) 644 return (EBUSY); 645 646 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT); 647 if (bif == NULL) 648 return (ENOMEM); 649 650 switch (ifs->if_type) { 651 case IFT_ETHER: 652 /* 653 * Place the interface into promiscuous mode. 654 */ 655 error = ifpromisc(ifs, 1); 656 if (error) 657 goto out; 658 break; 659 default: 660 error = EINVAL; 661 goto out; 662 } 663 664 bif->bif_ifp = ifs; 665 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 666 bif->bif_priority = BSTP_DEFAULT_PORT_PRIORITY; 667 bif->bif_path_cost = BSTP_DEFAULT_PATH_COST; 668 669 ifs->if_bridge = sc; 670 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 671 672 if (sc->sc_if.if_flags & IFF_RUNNING) 673 bstp_initialization(sc); 674 else 675 bstp_stop(sc); 676 677 out: 678 if (error) { 679 if (bif != NULL) 680 free(bif, M_DEVBUF); 681 } 682 return (error); 683 } 684 685 static int 686 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 687 { 688 struct ifbreq *req = arg; 689 struct bridge_iflist *bif; 690 691 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 692 if (bif == NULL) 693 return (ENOENT); 694 695 bridge_delete_member(sc, bif); 696 697 return (0); 698 } 699 700 static int 701 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 702 { 703 struct ifbreq *req = arg; 704 struct bridge_iflist *bif; 705 706 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 707 if (bif == NULL) 708 return (ENOENT); 709 710 req->ifbr_ifsflags = bif->bif_flags; 711 req->ifbr_state = bif->bif_state; 712 req->ifbr_priority = bif->bif_priority; 713 req->ifbr_path_cost = bif->bif_path_cost; 714 req->ifbr_portno = bif->bif_ifp->if_index & 0xff; 715 716 return (0); 717 } 718 719 static int 720 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 721 { 722 struct ifbreq *req = arg; 723 struct bridge_iflist *bif; 724 725 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 726 if (bif == NULL) 727 return (ENOENT); 728 729 if (req->ifbr_ifsflags & IFBIF_STP) { 730 switch (bif->bif_ifp->if_type) { 731 case IFT_ETHER: 732 /* These can do spanning tree. */ 733 break; 734 735 default: 736 /* Nothing else can. */ 737 return (EINVAL); 738 } 739 } 740 741 bif->bif_flags = req->ifbr_ifsflags; 742 743 if (sc->sc_if.if_flags & IFF_RUNNING) 744 bstp_initialization(sc); 745 746 return (0); 747 } 748 749 static int 750 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 751 { 752 struct ifbrparam *param = arg; 753 754 sc->sc_brtmax = param->ifbrp_csize; 755 bridge_rttrim(sc); 756 757 return (0); 758 } 759 760 static int 761 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 762 { 763 struct ifbrparam *param = arg; 764 765 param->ifbrp_csize = sc->sc_brtmax; 766 767 return (0); 768 } 769 770 static int 771 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 772 { 773 struct ifbifconf *bifc = arg; 774 struct bridge_iflist *bif; 775 struct ifbreq breq; 776 int count, len, error = 0; 777 778 count = 0; 779 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 780 count++; 781 782 if (bifc->ifbic_len == 0) { 783 bifc->ifbic_len = sizeof(breq) * count; 784 return (0); 785 } 786 787 count = 0; 788 len = bifc->ifbic_len; 789 memset(&breq, 0, sizeof breq); 790 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 791 if (len < sizeof(breq)) 792 break; 793 794 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 795 sizeof(breq.ifbr_ifsname)); 796 breq.ifbr_ifsflags = bif->bif_flags; 797 breq.ifbr_state = bif->bif_state; 798 breq.ifbr_priority = bif->bif_priority; 799 breq.ifbr_path_cost = bif->bif_path_cost; 800 breq.ifbr_portno = bif->bif_ifp->if_index & 0xff; 801 error = copyout(&breq, bifc->ifbic_req + count, sizeof(breq)); 802 if (error) 803 break; 804 count++; 805 len -= sizeof(breq); 806 } 807 808 bifc->ifbic_len = sizeof(breq) * count; 809 return (error); 810 } 811 812 static int 813 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 814 { 815 struct ifbaconf *bac = arg; 816 struct bridge_rtnode *brt; 817 struct ifbareq bareq; 818 int count = 0, error = 0, len; 819 820 if (bac->ifbac_len == 0) 821 return (0); 822 823 len = bac->ifbac_len; 824 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 825 if (len < sizeof(bareq)) 826 goto out; 827 memset(&bareq, 0, sizeof(bareq)); 828 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 829 sizeof(bareq.ifba_ifsname)); 830 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 831 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 832 bareq.ifba_expire = brt->brt_expire - time_uptime; 833 } else 834 bareq.ifba_expire = 0; 835 bareq.ifba_flags = brt->brt_flags; 836 837 error = copyout(&bareq, bac->ifbac_req + count, sizeof(bareq)); 838 if (error) 839 goto out; 840 count++; 841 len -= sizeof(bareq); 842 } 843 out: 844 bac->ifbac_len = sizeof(bareq) * count; 845 return (error); 846 } 847 848 static int 849 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 850 { 851 struct ifbareq *req = arg; 852 struct bridge_iflist *bif; 853 int error; 854 855 bif = bridge_lookup_member(sc, req->ifba_ifsname); 856 if (bif == NULL) 857 return (ENOENT); 858 859 error = bridge_rtupdate(sc, req->ifba_dst, bif->bif_ifp, 1, 860 req->ifba_flags); 861 862 return (error); 863 } 864 865 static int 866 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 867 { 868 struct ifbrparam *param = arg; 869 870 sc->sc_brttimeout = param->ifbrp_ctime; 871 872 return (0); 873 } 874 875 static int 876 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 877 { 878 struct ifbrparam *param = arg; 879 880 param->ifbrp_ctime = sc->sc_brttimeout; 881 882 return (0); 883 } 884 885 static int 886 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 887 { 888 struct ifbareq *req = arg; 889 890 return (bridge_rtdaddr(sc, req->ifba_dst)); 891 } 892 893 static int 894 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 895 { 896 struct ifbreq *req = arg; 897 898 bridge_rtflush(sc, req->ifbr_ifsflags); 899 900 return (0); 901 } 902 903 static int 904 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 905 { 906 struct ifbrparam *param = arg; 907 908 param->ifbrp_prio = sc->sc_bridge_priority; 909 910 return (0); 911 } 912 913 static int 914 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 915 { 916 struct ifbrparam *param = arg; 917 918 sc->sc_bridge_priority = param->ifbrp_prio; 919 920 if (sc->sc_if.if_flags & IFF_RUNNING) 921 bstp_initialization(sc); 922 923 return (0); 924 } 925 926 static int 927 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 928 { 929 struct ifbrparam *param = arg; 930 931 param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8; 932 933 return (0); 934 } 935 936 static int 937 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 938 { 939 struct ifbrparam *param = arg; 940 941 if (param->ifbrp_hellotime == 0) 942 return (EINVAL); 943 sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8; 944 945 if (sc->sc_if.if_flags & IFF_RUNNING) 946 bstp_initialization(sc); 947 948 return (0); 949 } 950 951 static int 952 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 953 { 954 struct ifbrparam *param = arg; 955 956 param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8; 957 958 return (0); 959 } 960 961 static int 962 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 963 { 964 struct ifbrparam *param = arg; 965 966 if (param->ifbrp_fwddelay == 0) 967 return (EINVAL); 968 sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8; 969 970 if (sc->sc_if.if_flags & IFF_RUNNING) 971 bstp_initialization(sc); 972 973 return (0); 974 } 975 976 static int 977 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 978 { 979 struct ifbrparam *param = arg; 980 981 param->ifbrp_maxage = sc->sc_bridge_max_age >> 8; 982 983 return (0); 984 } 985 986 static int 987 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 988 { 989 struct ifbrparam *param = arg; 990 991 if (param->ifbrp_maxage == 0) 992 return (EINVAL); 993 sc->sc_bridge_max_age = param->ifbrp_maxage << 8; 994 995 if (sc->sc_if.if_flags & IFF_RUNNING) 996 bstp_initialization(sc); 997 998 return (0); 999 } 1000 1001 static int 1002 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1003 { 1004 struct ifbreq *req = arg; 1005 struct bridge_iflist *bif; 1006 1007 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1008 if (bif == NULL) 1009 return (ENOENT); 1010 1011 bif->bif_priority = req->ifbr_priority; 1012 1013 if (sc->sc_if.if_flags & IFF_RUNNING) 1014 bstp_initialization(sc); 1015 1016 return (0); 1017 } 1018 1019 #if defined(BRIDGE_IPF) && defined(PFIL_HOOKS) 1020 static int 1021 bridge_ioctl_gfilt(struct bridge_softc *sc, void *arg) 1022 { 1023 struct ifbrparam *param = arg; 1024 1025 param->ifbrp_filter = sc->sc_filter_flags; 1026 1027 return (0); 1028 } 1029 1030 static int 1031 bridge_ioctl_sfilt(struct bridge_softc *sc, void *arg) 1032 { 1033 struct ifbrparam *param = arg; 1034 uint32_t nflags, oflags; 1035 1036 if (param->ifbrp_filter & ~IFBF_FILT_MASK) 1037 return (EINVAL); 1038 1039 nflags = param->ifbrp_filter; 1040 oflags = sc->sc_filter_flags; 1041 1042 if ((nflags & IFBF_FILT_USEIPF) && !(oflags & IFBF_FILT_USEIPF)) { 1043 pfil_add_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1044 &sc->sc_if.if_pfil); 1045 } 1046 if (!(nflags & IFBF_FILT_USEIPF) && (oflags & IFBF_FILT_USEIPF)) { 1047 pfil_remove_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1048 &sc->sc_if.if_pfil); 1049 } 1050 1051 sc->sc_filter_flags = nflags; 1052 1053 return (0); 1054 } 1055 #endif /* BRIDGE_IPF && PFIL_HOOKS */ 1056 1057 static int 1058 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1059 { 1060 struct ifbreq *req = arg; 1061 struct bridge_iflist *bif; 1062 1063 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1064 if (bif == NULL) 1065 return (ENOENT); 1066 1067 bif->bif_path_cost = req->ifbr_path_cost; 1068 1069 if (sc->sc_if.if_flags & IFF_RUNNING) 1070 bstp_initialization(sc); 1071 1072 return (0); 1073 } 1074 1075 /* 1076 * bridge_ifdetach: 1077 * 1078 * Detach an interface from a bridge. Called when a member 1079 * interface is detaching. 1080 */ 1081 void 1082 bridge_ifdetach(struct ifnet *ifp) 1083 { 1084 struct bridge_softc *sc = ifp->if_bridge; 1085 struct ifbreq breq; 1086 1087 memset(&breq, 0, sizeof(breq)); 1088 strlcpy(breq.ifbr_ifsname, ifp->if_xname, sizeof(breq.ifbr_ifsname)); 1089 1090 (void) bridge_ioctl_del(sc, &breq); 1091 } 1092 1093 /* 1094 * bridge_init: 1095 * 1096 * Initialize a bridge interface. 1097 */ 1098 static int 1099 bridge_init(struct ifnet *ifp) 1100 { 1101 struct bridge_softc *sc = ifp->if_softc; 1102 1103 if (ifp->if_flags & IFF_RUNNING) 1104 return (0); 1105 1106 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1107 bridge_timer, sc); 1108 1109 ifp->if_flags |= IFF_RUNNING; 1110 bstp_initialization(sc); 1111 return (0); 1112 } 1113 1114 /* 1115 * bridge_stop: 1116 * 1117 * Stop the bridge interface. 1118 */ 1119 static void 1120 bridge_stop(struct ifnet *ifp, int disable) 1121 { 1122 struct bridge_softc *sc = ifp->if_softc; 1123 1124 if ((ifp->if_flags & IFF_RUNNING) == 0) 1125 return; 1126 1127 callout_stop(&sc->sc_brcallout); 1128 bstp_stop(sc); 1129 1130 IF_PURGE(&ifp->if_snd); 1131 1132 bridge_rtflush(sc, IFBF_FLUSHDYN); 1133 1134 ifp->if_flags &= ~IFF_RUNNING; 1135 } 1136 1137 /* 1138 * bridge_enqueue: 1139 * 1140 * Enqueue a packet on a bridge member interface. 1141 * 1142 * NOTE: must be called at splnet(). 1143 */ 1144 void 1145 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m, 1146 int runfilt) 1147 { 1148 ALTQ_DECL(struct altq_pktattr pktattr;) 1149 int len, error; 1150 short mflags; 1151 1152 /* 1153 * Clear any in-bound checksum flags for this packet. 1154 */ 1155 m->m_pkthdr.csum_flags = 0; 1156 1157 #ifdef PFIL_HOOKS 1158 if (runfilt) { 1159 if (pfil_run_hooks(&sc->sc_if.if_pfil, &m, 1160 dst_ifp, PFIL_OUT) != 0) { 1161 if (m != NULL) 1162 m_freem(m); 1163 return; 1164 } 1165 if (m == NULL) 1166 return; 1167 } 1168 #endif /* PFIL_HOOKS */ 1169 1170 #ifdef ALTQ 1171 /* 1172 * If ALTQ is enabled on the member interface, do 1173 * classification; the queueing discipline might 1174 * not require classification, but might require 1175 * the address family/header pointer in the pktattr. 1176 */ 1177 if (ALTQ_IS_ENABLED(&dst_ifp->if_snd)) { 1178 /* XXX IFT_ETHER */ 1179 altq_etherclassify(&dst_ifp->if_snd, m, &pktattr); 1180 } 1181 #endif /* ALTQ */ 1182 1183 len = m->m_pkthdr.len; 1184 m->m_flags |= M_PROTO1; 1185 mflags = m->m_flags; 1186 IFQ_ENQUEUE(&dst_ifp->if_snd, m, &pktattr, error); 1187 if (error) { 1188 /* mbuf is already freed */ 1189 sc->sc_if.if_oerrors++; 1190 return; 1191 } 1192 1193 sc->sc_if.if_opackets++; 1194 sc->sc_if.if_obytes += len; 1195 1196 dst_ifp->if_obytes += len; 1197 1198 if (mflags & M_MCAST) { 1199 sc->sc_if.if_omcasts++; 1200 dst_ifp->if_omcasts++; 1201 } 1202 1203 if ((dst_ifp->if_flags & IFF_OACTIVE) == 0) 1204 (*dst_ifp->if_start)(dst_ifp); 1205 } 1206 1207 /* 1208 * bridge_output: 1209 * 1210 * Send output from a bridge member interface. This 1211 * performs the bridging function for locally originated 1212 * packets. 1213 * 1214 * The mbuf has the Ethernet header already attached. We must 1215 * enqueue or free the mbuf before returning. 1216 */ 1217 int 1218 bridge_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa, 1219 struct rtentry *rt) 1220 { 1221 struct ether_header *eh; 1222 struct ifnet *dst_if; 1223 struct bridge_softc *sc; 1224 int s; 1225 1226 if (m->m_len < ETHER_HDR_LEN) { 1227 m = m_pullup(m, ETHER_HDR_LEN); 1228 if (m == NULL) 1229 return (0); 1230 } 1231 1232 eh = mtod(m, struct ether_header *); 1233 sc = ifp->if_bridge; 1234 1235 s = splnet(); 1236 1237 /* 1238 * If bridge is down, but the original output interface is up, 1239 * go ahead and send out that interface. Otherwise, the packet 1240 * is dropped below. 1241 */ 1242 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1243 dst_if = ifp; 1244 goto sendunicast; 1245 } 1246 1247 /* 1248 * If the packet is a multicast, or we don't know a better way to 1249 * get there, send to all interfaces. 1250 */ 1251 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1252 dst_if = NULL; 1253 else 1254 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1255 if (dst_if == NULL) { 1256 struct bridge_iflist *bif; 1257 struct mbuf *mc; 1258 int used = 0; 1259 1260 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1261 dst_if = bif->bif_ifp; 1262 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1263 continue; 1264 1265 /* 1266 * If this is not the original output interface, 1267 * and the interface is participating in spanning 1268 * tree, make sure the port is in a state that 1269 * allows forwarding. 1270 */ 1271 if (dst_if != ifp && 1272 (bif->bif_flags & IFBIF_STP) != 0) { 1273 switch (bif->bif_state) { 1274 case BSTP_IFSTATE_BLOCKING: 1275 case BSTP_IFSTATE_LISTENING: 1276 case BSTP_IFSTATE_DISABLED: 1277 continue; 1278 } 1279 } 1280 1281 if (LIST_NEXT(bif, bif_next) == NULL) { 1282 used = 1; 1283 mc = m; 1284 } else { 1285 mc = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1286 if (mc == NULL) { 1287 sc->sc_if.if_oerrors++; 1288 continue; 1289 } 1290 } 1291 1292 bridge_enqueue(sc, dst_if, mc, 0); 1293 } 1294 if (used == 0) 1295 m_freem(m); 1296 splx(s); 1297 return (0); 1298 } 1299 1300 sendunicast: 1301 /* 1302 * XXX Spanning tree consideration here? 1303 */ 1304 1305 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1306 m_freem(m); 1307 splx(s); 1308 return (0); 1309 } 1310 1311 bridge_enqueue(sc, dst_if, m, 0); 1312 1313 splx(s); 1314 return (0); 1315 } 1316 1317 /* 1318 * bridge_start: 1319 * 1320 * Start output on a bridge. 1321 * 1322 * NOTE: This routine should never be called in this implementation. 1323 */ 1324 static void 1325 bridge_start(struct ifnet *ifp) 1326 { 1327 1328 printf("%s: bridge_start() called\n", ifp->if_xname); 1329 } 1330 1331 /* 1332 * bridge_forward: 1333 * 1334 * The forwarding function of the bridge. 1335 */ 1336 static void 1337 bridge_forward(void *v) 1338 { 1339 struct bridge_softc *sc = v; 1340 struct mbuf *m; 1341 struct bridge_iflist *bif; 1342 struct ifnet *src_if, *dst_if; 1343 struct ether_header *eh; 1344 int s; 1345 1346 mutex_enter(softnet_lock); 1347 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1348 mutex_exit(softnet_lock); 1349 return; 1350 } 1351 1352 s = splnet(); 1353 while (1) { 1354 IFQ_POLL(&sc->sc_if.if_snd, m); 1355 if (m == NULL) 1356 break; 1357 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 1358 1359 src_if = m->m_pkthdr.rcvif; 1360 1361 sc->sc_if.if_ipackets++; 1362 sc->sc_if.if_ibytes += m->m_pkthdr.len; 1363 1364 /* 1365 * Look up the bridge_iflist. 1366 */ 1367 bif = bridge_lookup_member_if(sc, src_if); 1368 if (bif == NULL) { 1369 /* Interface is not a bridge member (anymore?) */ 1370 m_freem(m); 1371 continue; 1372 } 1373 1374 if (bif->bif_flags & IFBIF_STP) { 1375 switch (bif->bif_state) { 1376 case BSTP_IFSTATE_BLOCKING: 1377 case BSTP_IFSTATE_LISTENING: 1378 case BSTP_IFSTATE_DISABLED: 1379 m_freem(m); 1380 continue; 1381 } 1382 } 1383 1384 eh = mtod(m, struct ether_header *); 1385 1386 /* 1387 * If the interface is learning, and the source 1388 * address is valid and not multicast, record 1389 * the address. 1390 */ 1391 if ((bif->bif_flags & IFBIF_LEARNING) != 0 && 1392 ETHER_IS_MULTICAST(eh->ether_shost) == 0 && 1393 (eh->ether_shost[0] == 0 && 1394 eh->ether_shost[1] == 0 && 1395 eh->ether_shost[2] == 0 && 1396 eh->ether_shost[3] == 0 && 1397 eh->ether_shost[4] == 0 && 1398 eh->ether_shost[5] == 0) == 0) { 1399 (void) bridge_rtupdate(sc, eh->ether_shost, 1400 src_if, 0, IFBAF_DYNAMIC); 1401 } 1402 1403 if ((bif->bif_flags & IFBIF_STP) != 0 && 1404 bif->bif_state == BSTP_IFSTATE_LEARNING) { 1405 m_freem(m); 1406 continue; 1407 } 1408 1409 /* 1410 * At this point, the port either doesn't participate 1411 * in spanning tree or it is in the forwarding state. 1412 */ 1413 1414 /* 1415 * If the packet is unicast, destined for someone on 1416 * "this" side of the bridge, drop it. 1417 */ 1418 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1419 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1420 if (src_if == dst_if) { 1421 m_freem(m); 1422 continue; 1423 } 1424 } else { 1425 /* ...forward it to all interfaces. */ 1426 sc->sc_if.if_imcasts++; 1427 dst_if = NULL; 1428 } 1429 1430 #ifdef PFIL_HOOKS 1431 if (pfil_run_hooks(&sc->sc_if.if_pfil, &m, 1432 m->m_pkthdr.rcvif, PFIL_IN) != 0) { 1433 if (m != NULL) 1434 m_freem(m); 1435 continue; 1436 } 1437 if (m == NULL) 1438 continue; 1439 #endif /* PFIL_HOOKS */ 1440 1441 if (dst_if == NULL) { 1442 bridge_broadcast(sc, src_if, m); 1443 continue; 1444 } 1445 1446 /* 1447 * At this point, we're dealing with a unicast frame 1448 * going to a different interface. 1449 */ 1450 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1451 m_freem(m); 1452 continue; 1453 } 1454 bif = bridge_lookup_member_if(sc, dst_if); 1455 if (bif == NULL) { 1456 /* Not a member of the bridge (anymore?) */ 1457 m_freem(m); 1458 continue; 1459 } 1460 1461 if (bif->bif_flags & IFBIF_STP) { 1462 switch (bif->bif_state) { 1463 case BSTP_IFSTATE_DISABLED: 1464 case BSTP_IFSTATE_BLOCKING: 1465 m_freem(m); 1466 continue; 1467 } 1468 } 1469 1470 bridge_enqueue(sc, dst_if, m, 1); 1471 } 1472 splx(s); 1473 mutex_exit(softnet_lock); 1474 } 1475 1476 /* 1477 * bridge_input: 1478 * 1479 * Receive input from a member interface. Queue the packet for 1480 * bridging if it is not for us. 1481 * should be called at splnet() 1482 */ 1483 struct mbuf * 1484 bridge_input(struct ifnet *ifp, struct mbuf *m) 1485 { 1486 struct bridge_softc *sc = ifp->if_bridge; 1487 struct bridge_iflist *bif; 1488 struct ether_header *eh; 1489 struct mbuf *mc; 1490 1491 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) 1492 return (m); 1493 1494 bif = bridge_lookup_member_if(sc, ifp); 1495 if (bif == NULL) 1496 return (m); 1497 1498 eh = mtod(m, struct ether_header *); 1499 1500 if (m->m_flags & (M_BCAST|M_MCAST)) { 1501 if (bif->bif_flags & IFBIF_STP) { 1502 /* Tap off 802.1D packets; they do not get forwarded. */ 1503 if (memcmp(eh->ether_dhost, bstp_etheraddr, 1504 ETHER_ADDR_LEN) == 0) { 1505 m = bstp_input(sc, bif, m); 1506 if (m == NULL) 1507 return (NULL); 1508 } 1509 1510 switch (bif->bif_state) { 1511 case BSTP_IFSTATE_BLOCKING: 1512 case BSTP_IFSTATE_LISTENING: 1513 case BSTP_IFSTATE_DISABLED: 1514 return (m); 1515 } 1516 } 1517 1518 /* 1519 * Make a deep copy of the packet and enqueue the copy 1520 * for bridge processing; return the original packet for 1521 * local processing. 1522 */ 1523 if (IF_QFULL(&sc->sc_if.if_snd)) { 1524 IF_DROP(&sc->sc_if.if_snd); 1525 return (m); 1526 } 1527 mc = m_dup(m, 0, M_COPYALL, M_NOWAIT); 1528 if (mc == NULL) 1529 return (m); 1530 1531 /* Perform the bridge forwarding function with the copy. */ 1532 IF_ENQUEUE(&sc->sc_if.if_snd, mc); 1533 softint_schedule(sc->sc_softintr); 1534 1535 /* Return the original packet for local processing. */ 1536 return (m); 1537 } 1538 1539 if (bif->bif_flags & IFBIF_STP) { 1540 switch (bif->bif_state) { 1541 case BSTP_IFSTATE_BLOCKING: 1542 case BSTP_IFSTATE_LISTENING: 1543 case BSTP_IFSTATE_DISABLED: 1544 return (m); 1545 } 1546 } 1547 1548 /* 1549 * Unicast. Make sure it's not for us. 1550 */ 1551 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1552 /* It is destined for us. */ 1553 if (memcmp(CLLADDR(bif->bif_ifp->if_sadl), eh->ether_dhost, 1554 ETHER_ADDR_LEN) == 0 1555 #if NCARP > 0 1556 || (bif->bif_ifp->if_carp && carp_ourether(bif->bif_ifp->if_carp, 1557 eh, IFT_ETHER, 0) != NULL) 1558 #endif /* NCARP > 0 */ 1559 ) { 1560 if (bif->bif_flags & IFBIF_LEARNING) 1561 (void) bridge_rtupdate(sc, 1562 eh->ether_shost, ifp, 0, IFBAF_DYNAMIC); 1563 m->m_pkthdr.rcvif = bif->bif_ifp; 1564 return (m); 1565 } 1566 1567 /* We just received a packet that we sent out. */ 1568 if (memcmp(CLLADDR(bif->bif_ifp->if_sadl), eh->ether_shost, 1569 ETHER_ADDR_LEN) == 0 1570 #if NCARP > 0 1571 || (bif->bif_ifp->if_carp && carp_ourether(bif->bif_ifp->if_carp, 1572 eh, IFT_ETHER, 1) != NULL) 1573 #endif /* NCARP > 0 */ 1574 ) { 1575 m_freem(m); 1576 return (NULL); 1577 } 1578 } 1579 1580 /* Perform the bridge forwarding function. */ 1581 if (IF_QFULL(&sc->sc_if.if_snd)) { 1582 IF_DROP(&sc->sc_if.if_snd); 1583 m_freem(m); 1584 return (NULL); 1585 } 1586 IF_ENQUEUE(&sc->sc_if.if_snd, m); 1587 softint_schedule(sc->sc_softintr); 1588 1589 return (NULL); 1590 } 1591 1592 /* 1593 * bridge_broadcast: 1594 * 1595 * Send a frame to all interfaces that are members of 1596 * the bridge, except for the one on which the packet 1597 * arrived. 1598 */ 1599 static void 1600 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 1601 struct mbuf *m) 1602 { 1603 struct bridge_iflist *bif; 1604 struct mbuf *mc; 1605 struct ifnet *dst_if; 1606 int used = 0; 1607 1608 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1609 dst_if = bif->bif_ifp; 1610 if (dst_if == src_if) 1611 continue; 1612 1613 if (bif->bif_flags & IFBIF_STP) { 1614 switch (bif->bif_state) { 1615 case BSTP_IFSTATE_BLOCKING: 1616 case BSTP_IFSTATE_DISABLED: 1617 continue; 1618 } 1619 } 1620 1621 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && 1622 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 1623 continue; 1624 1625 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1626 continue; 1627 1628 if (LIST_NEXT(bif, bif_next) == NULL) { 1629 mc = m; 1630 used = 1; 1631 } else { 1632 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1633 if (mc == NULL) { 1634 sc->sc_if.if_oerrors++; 1635 continue; 1636 } 1637 } 1638 1639 bridge_enqueue(sc, dst_if, mc, 1); 1640 } 1641 if (used == 0) 1642 m_freem(m); 1643 } 1644 1645 /* 1646 * bridge_rtupdate: 1647 * 1648 * Add a bridge routing entry. 1649 */ 1650 static int 1651 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 1652 struct ifnet *dst_if, int setflags, uint8_t flags) 1653 { 1654 struct bridge_rtnode *brt; 1655 int error, s; 1656 1657 /* 1658 * A route for this destination might already exist. If so, 1659 * update it, otherwise create a new one. 1660 */ 1661 if ((brt = bridge_rtnode_lookup(sc, dst)) == NULL) { 1662 if (sc->sc_brtcnt >= sc->sc_brtmax) 1663 return (ENOSPC); 1664 1665 /* 1666 * Allocate a new bridge forwarding node, and 1667 * initialize the expiration time and Ethernet 1668 * address. 1669 */ 1670 s = splnet(); 1671 brt = pool_get(&bridge_rtnode_pool, PR_NOWAIT); 1672 splx(s); 1673 if (brt == NULL) 1674 return (ENOMEM); 1675 1676 memset(brt, 0, sizeof(*brt)); 1677 brt->brt_expire = time_uptime + sc->sc_brttimeout; 1678 brt->brt_flags = IFBAF_DYNAMIC; 1679 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 1680 1681 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 1682 s = splnet(); 1683 pool_put(&bridge_rtnode_pool, brt); 1684 splx(s); 1685 return (error); 1686 } 1687 } 1688 1689 brt->brt_ifp = dst_if; 1690 if (setflags) { 1691 brt->brt_flags = flags; 1692 if (flags & IFBAF_STATIC) 1693 brt->brt_expire = 0; 1694 else 1695 brt->brt_expire = time_uptime + sc->sc_brttimeout; 1696 } 1697 1698 return (0); 1699 } 1700 1701 /* 1702 * bridge_rtlookup: 1703 * 1704 * Lookup the destination interface for an address. 1705 */ 1706 static struct ifnet * 1707 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) 1708 { 1709 struct bridge_rtnode *brt; 1710 1711 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) 1712 return (NULL); 1713 1714 return (brt->brt_ifp); 1715 } 1716 1717 /* 1718 * bridge_rttrim: 1719 * 1720 * Trim the routine table so that we have a number 1721 * of routing entries less than or equal to the 1722 * maximum number. 1723 */ 1724 static void 1725 bridge_rttrim(struct bridge_softc *sc) 1726 { 1727 struct bridge_rtnode *brt, *nbrt; 1728 1729 /* Make sure we actually need to do this. */ 1730 if (sc->sc_brtcnt <= sc->sc_brtmax) 1731 return; 1732 1733 /* Force an aging cycle; this might trim enough addresses. */ 1734 bridge_rtage(sc); 1735 if (sc->sc_brtcnt <= sc->sc_brtmax) 1736 return; 1737 1738 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1739 nbrt = LIST_NEXT(brt, brt_list); 1740 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1741 bridge_rtnode_destroy(sc, brt); 1742 if (sc->sc_brtcnt <= sc->sc_brtmax) 1743 return; 1744 } 1745 } 1746 } 1747 1748 /* 1749 * bridge_timer: 1750 * 1751 * Aging timer for the bridge. 1752 */ 1753 static void 1754 bridge_timer(void *arg) 1755 { 1756 struct bridge_softc *sc = arg; 1757 int s; 1758 1759 s = splnet(); 1760 bridge_rtage(sc); 1761 splx(s); 1762 1763 if (sc->sc_if.if_flags & IFF_RUNNING) 1764 callout_reset(&sc->sc_brcallout, 1765 bridge_rtable_prune_period * hz, bridge_timer, sc); 1766 } 1767 1768 /* 1769 * bridge_rtage: 1770 * 1771 * Perform an aging cycle. 1772 */ 1773 static void 1774 bridge_rtage(struct bridge_softc *sc) 1775 { 1776 struct bridge_rtnode *brt, *nbrt; 1777 1778 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1779 nbrt = LIST_NEXT(brt, brt_list); 1780 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1781 if (time_uptime >= brt->brt_expire) 1782 bridge_rtnode_destroy(sc, brt); 1783 } 1784 } 1785 } 1786 1787 /* 1788 * bridge_rtflush: 1789 * 1790 * Remove all dynamic addresses from the bridge. 1791 */ 1792 static void 1793 bridge_rtflush(struct bridge_softc *sc, int full) 1794 { 1795 struct bridge_rtnode *brt, *nbrt; 1796 1797 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1798 nbrt = LIST_NEXT(brt, brt_list); 1799 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 1800 bridge_rtnode_destroy(sc, brt); 1801 } 1802 } 1803 1804 /* 1805 * bridge_rtdaddr: 1806 * 1807 * Remove an address from the table. 1808 */ 1809 static int 1810 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) 1811 { 1812 struct bridge_rtnode *brt; 1813 1814 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) 1815 return (ENOENT); 1816 1817 bridge_rtnode_destroy(sc, brt); 1818 return (0); 1819 } 1820 1821 /* 1822 * bridge_rtdelete: 1823 * 1824 * Delete routes to a speicifc member interface. 1825 */ 1826 static void 1827 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp) 1828 { 1829 struct bridge_rtnode *brt, *nbrt; 1830 1831 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 1832 nbrt = LIST_NEXT(brt, brt_list); 1833 if (brt->brt_ifp == ifp) 1834 bridge_rtnode_destroy(sc, brt); 1835 } 1836 } 1837 1838 /* 1839 * bridge_rtable_init: 1840 * 1841 * Initialize the route table for this bridge. 1842 */ 1843 static int 1844 bridge_rtable_init(struct bridge_softc *sc) 1845 { 1846 int i; 1847 1848 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 1849 M_DEVBUF, M_NOWAIT); 1850 if (sc->sc_rthash == NULL) 1851 return (ENOMEM); 1852 1853 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 1854 LIST_INIT(&sc->sc_rthash[i]); 1855 1856 sc->sc_rthash_key = cprng_fast32(); 1857 1858 LIST_INIT(&sc->sc_rtlist); 1859 1860 return (0); 1861 } 1862 1863 /* 1864 * bridge_rtable_fini: 1865 * 1866 * Deconstruct the route table for this bridge. 1867 */ 1868 static void 1869 bridge_rtable_fini(struct bridge_softc *sc) 1870 { 1871 1872 free(sc->sc_rthash, M_DEVBUF); 1873 } 1874 1875 /* 1876 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 1877 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 1878 */ 1879 #define mix(a, b, c) \ 1880 do { \ 1881 a -= b; a -= c; a ^= (c >> 13); \ 1882 b -= c; b -= a; b ^= (a << 8); \ 1883 c -= a; c -= b; c ^= (b >> 13); \ 1884 a -= b; a -= c; a ^= (c >> 12); \ 1885 b -= c; b -= a; b ^= (a << 16); \ 1886 c -= a; c -= b; c ^= (b >> 5); \ 1887 a -= b; a -= c; a ^= (c >> 3); \ 1888 b -= c; b -= a; b ^= (a << 10); \ 1889 c -= a; c -= b; c ^= (b >> 15); \ 1890 } while (/*CONSTCOND*/0) 1891 1892 static inline uint32_t 1893 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 1894 { 1895 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 1896 1897 b += addr[5] << 8; 1898 b += addr[4]; 1899 a += addr[3] << 24; 1900 a += addr[2] << 16; 1901 a += addr[1] << 8; 1902 a += addr[0]; 1903 1904 mix(a, b, c); 1905 1906 return (c & BRIDGE_RTHASH_MASK); 1907 } 1908 1909 #undef mix 1910 1911 /* 1912 * bridge_rtnode_lookup: 1913 * 1914 * Look up a bridge route node for the specified destination. 1915 */ 1916 static struct bridge_rtnode * 1917 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr) 1918 { 1919 struct bridge_rtnode *brt; 1920 uint32_t hash; 1921 int dir; 1922 1923 hash = bridge_rthash(sc, addr); 1924 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 1925 dir = memcmp(addr, brt->brt_addr, ETHER_ADDR_LEN); 1926 if (dir == 0) 1927 return (brt); 1928 if (dir > 0) 1929 return (NULL); 1930 } 1931 1932 return (NULL); 1933 } 1934 1935 /* 1936 * bridge_rtnode_insert: 1937 * 1938 * Insert the specified bridge node into the route table. We 1939 * assume the entry is not already in the table. 1940 */ 1941 static int 1942 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 1943 { 1944 struct bridge_rtnode *lbrt; 1945 uint32_t hash; 1946 int dir; 1947 1948 hash = bridge_rthash(sc, brt->brt_addr); 1949 1950 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 1951 if (lbrt == NULL) { 1952 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 1953 goto out; 1954 } 1955 1956 do { 1957 dir = memcmp(brt->brt_addr, lbrt->brt_addr, ETHER_ADDR_LEN); 1958 if (dir == 0) 1959 return (EEXIST); 1960 if (dir > 0) { 1961 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 1962 goto out; 1963 } 1964 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 1965 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 1966 goto out; 1967 } 1968 lbrt = LIST_NEXT(lbrt, brt_hash); 1969 } while (lbrt != NULL); 1970 1971 #ifdef DIAGNOSTIC 1972 panic("bridge_rtnode_insert: impossible"); 1973 #endif 1974 1975 out: 1976 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 1977 sc->sc_brtcnt++; 1978 1979 return (0); 1980 } 1981 1982 /* 1983 * bridge_rtnode_destroy: 1984 * 1985 * Destroy a bridge rtnode. 1986 */ 1987 static void 1988 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 1989 { 1990 int s = splnet(); 1991 1992 LIST_REMOVE(brt, brt_hash); 1993 1994 LIST_REMOVE(brt, brt_list); 1995 sc->sc_brtcnt--; 1996 pool_put(&bridge_rtnode_pool, brt); 1997 1998 splx(s); 1999 } 2000 2001 #if defined(BRIDGE_IPF) && defined(PFIL_HOOKS) 2002 extern struct pfil_head inet_pfil_hook; /* XXX */ 2003 extern struct pfil_head inet6_pfil_hook; /* XXX */ 2004 2005 /* 2006 * Send bridge packets through IPF if they are one of the types IPF can deal 2007 * with, or if they are ARP or REVARP. (IPF will pass ARP and REVARP without 2008 * question.) 2009 */ 2010 static int 2011 bridge_ipf(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 2012 { 2013 int snap, error; 2014 struct ether_header *eh1, eh2; 2015 struct llc llc1; 2016 uint16_t ether_type; 2017 2018 snap = 0; 2019 error = -1; /* Default error if not error == 0 */ 2020 eh1 = mtod(*mp, struct ether_header *); 2021 ether_type = ntohs(eh1->ether_type); 2022 2023 /* 2024 * Check for SNAP/LLC. 2025 */ 2026 if (ether_type < ETHERMTU) { 2027 struct llc *llc2 = (struct llc *)(eh1 + 1); 2028 2029 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 2030 llc2->llc_dsap == LLC_SNAP_LSAP && 2031 llc2->llc_ssap == LLC_SNAP_LSAP && 2032 llc2->llc_control == LLC_UI) { 2033 ether_type = htons(llc2->llc_un.type_snap.ether_type); 2034 snap = 1; 2035 } 2036 } 2037 2038 /* 2039 * If we're trying to filter bridge traffic, don't look at anything 2040 * other than IP and ARP traffic. If the filter doesn't understand 2041 * IPv6, don't allow IPv6 through the bridge either. This is lame 2042 * since if we really wanted, say, an AppleTalk filter, we are hosed, 2043 * but of course we don't have an AppleTalk filter to begin with. 2044 * (Note that since IPF doesn't understand ARP it will pass *ALL* 2045 * ARP traffic.) 2046 */ 2047 switch (ether_type) { 2048 case ETHERTYPE_ARP: 2049 case ETHERTYPE_REVARP: 2050 return 0; /* Automatically pass */ 2051 case ETHERTYPE_IP: 2052 # ifdef INET6 2053 case ETHERTYPE_IPV6: 2054 # endif /* INET6 */ 2055 break; 2056 default: 2057 goto bad; 2058 } 2059 2060 /* Strip off the Ethernet header and keep a copy. */ 2061 m_copydata(*mp, 0, ETHER_HDR_LEN, (void *) &eh2); 2062 m_adj(*mp, ETHER_HDR_LEN); 2063 2064 /* Strip off snap header, if present */ 2065 if (snap) { 2066 m_copydata(*mp, 0, sizeof(struct llc), (void *) &llc1); 2067 m_adj(*mp, sizeof(struct llc)); 2068 } 2069 2070 /* 2071 * Check basic packet sanity and run IPF through pfil. 2072 */ 2073 KASSERT(!cpu_intr_p()); 2074 switch (ether_type) 2075 { 2076 case ETHERTYPE_IP : 2077 error = (dir == PFIL_IN) ? bridge_ip_checkbasic(mp) : 0; 2078 if (error == 0) 2079 error = pfil_run_hooks(&inet_pfil_hook, mp, ifp, dir); 2080 break; 2081 # ifdef INET6 2082 case ETHERTYPE_IPV6 : 2083 error = (dir == PFIL_IN) ? bridge_ip6_checkbasic(mp) : 0; 2084 if (error == 0) 2085 error = pfil_run_hooks(&inet6_pfil_hook, mp, ifp, dir); 2086 break; 2087 # endif 2088 default : 2089 error = 0; 2090 break; 2091 } 2092 2093 if (*mp == NULL) 2094 return error; 2095 if (error != 0) 2096 goto bad; 2097 2098 error = -1; 2099 2100 /* 2101 * Finally, put everything back the way it was and return 2102 */ 2103 if (snap) { 2104 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 2105 if (*mp == NULL) 2106 return error; 2107 bcopy(&llc1, mtod(*mp, void *), sizeof(struct llc)); 2108 } 2109 2110 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 2111 if (*mp == NULL) 2112 return error; 2113 bcopy(&eh2, mtod(*mp, void *), ETHER_HDR_LEN); 2114 2115 return 0; 2116 2117 bad: 2118 m_freem(*mp); 2119 *mp = NULL; 2120 return error; 2121 } 2122 2123 /* 2124 * Perform basic checks on header size since 2125 * IPF assumes ip_input has already processed 2126 * it for it. Cut-and-pasted from ip_input.c. 2127 * Given how simple the IPv6 version is, 2128 * does the IPv4 version really need to be 2129 * this complicated? 2130 * 2131 * XXX Should we update ipstat here, or not? 2132 * XXX Right now we update ipstat but not 2133 * XXX csum_counter. 2134 */ 2135 static int 2136 bridge_ip_checkbasic(struct mbuf **mp) 2137 { 2138 struct mbuf *m = *mp; 2139 struct ip *ip; 2140 int len, hlen; 2141 2142 if (*mp == NULL) 2143 return -1; 2144 2145 if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2146 if ((m = m_copyup(m, sizeof(struct ip), 2147 (max_linkhdr + 3) & ~3)) == NULL) { 2148 /* XXXJRT new stat, please */ 2149 ip_statinc(IP_STAT_TOOSMALL); 2150 goto bad; 2151 } 2152 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 2153 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 2154 ip_statinc(IP_STAT_TOOSMALL); 2155 goto bad; 2156 } 2157 } 2158 ip = mtod(m, struct ip *); 2159 if (ip == NULL) goto bad; 2160 2161 if (ip->ip_v != IPVERSION) { 2162 ip_statinc(IP_STAT_BADVERS); 2163 goto bad; 2164 } 2165 hlen = ip->ip_hl << 2; 2166 if (hlen < sizeof(struct ip)) { /* minimum header length */ 2167 ip_statinc(IP_STAT_BADHLEN); 2168 goto bad; 2169 } 2170 if (hlen > m->m_len) { 2171 if ((m = m_pullup(m, hlen)) == 0) { 2172 ip_statinc(IP_STAT_BADHLEN); 2173 goto bad; 2174 } 2175 ip = mtod(m, struct ip *); 2176 if (ip == NULL) goto bad; 2177 } 2178 2179 switch (m->m_pkthdr.csum_flags & 2180 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) | 2181 M_CSUM_IPv4_BAD)) { 2182 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 2183 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); */ 2184 goto bad; 2185 2186 case M_CSUM_IPv4: 2187 /* Checksum was okay. */ 2188 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); */ 2189 break; 2190 2191 default: 2192 /* Must compute it ourselves. */ 2193 /* INET_CSUM_COUNTER_INCR(&ip_swcsum); */ 2194 if (in_cksum(m, hlen) != 0) 2195 goto bad; 2196 break; 2197 } 2198 2199 /* Retrieve the packet length. */ 2200 len = ntohs(ip->ip_len); 2201 2202 /* 2203 * Check for additional length bogosity 2204 */ 2205 if (len < hlen) { 2206 ip_statinc(IP_STAT_BADLEN); 2207 goto bad; 2208 } 2209 2210 /* 2211 * Check that the amount of data in the buffers 2212 * is as at least much as the IP header would have us expect. 2213 * Drop packet if shorter than we expect. 2214 */ 2215 if (m->m_pkthdr.len < len) { 2216 ip_statinc(IP_STAT_TOOSHORT); 2217 goto bad; 2218 } 2219 2220 /* Checks out, proceed */ 2221 *mp = m; 2222 return 0; 2223 2224 bad: 2225 *mp = m; 2226 return -1; 2227 } 2228 2229 # ifdef INET6 2230 /* 2231 * Same as above, but for IPv6. 2232 * Cut-and-pasted from ip6_input.c. 2233 * XXX Should we update ip6stat, or not? 2234 */ 2235 static int 2236 bridge_ip6_checkbasic(struct mbuf **mp) 2237 { 2238 struct mbuf *m = *mp; 2239 struct ip6_hdr *ip6; 2240 2241 /* 2242 * If the IPv6 header is not aligned, slurp it up into a new 2243 * mbuf with space for link headers, in the event we forward 2244 * it. Otherwise, if it is aligned, make sure the entire base 2245 * IPv6 header is in the first mbuf of the chain. 2246 */ 2247 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2248 struct ifnet *inifp = m->m_pkthdr.rcvif; 2249 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 2250 (max_linkhdr + 3) & ~3)) == NULL) { 2251 /* XXXJRT new stat, please */ 2252 ip6_statinc(IP6_STAT_TOOSMALL); 2253 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2254 goto bad; 2255 } 2256 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 2257 struct ifnet *inifp = m->m_pkthdr.rcvif; 2258 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 2259 ip6_statinc(IP6_STAT_TOOSMALL); 2260 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2261 goto bad; 2262 } 2263 } 2264 2265 ip6 = mtod(m, struct ip6_hdr *); 2266 2267 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 2268 ip6_statinc(IP6_STAT_BADVERS); 2269 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 2270 goto bad; 2271 } 2272 2273 /* Checks out, proceed */ 2274 *mp = m; 2275 return 0; 2276 2277 bad: 2278 *mp = m; 2279 return -1; 2280 } 2281 # endif /* INET6 */ 2282 #endif /* BRIDGE_IPF && PFIL_HOOKS */ 2283
Indexes created Thu Oct 02 14:10:14 GMT 2025